package com.hao.netty.chapter03;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.sctp.nio.NioSctpServerChannel;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;

/**
 * @Description
 *  基于netty实现的时间服务器
* @Date 2020/1/11
 * @Author songhao
 **/
public class TimeServer {

    public void bind(int port) throws Exception{
        //配置服务端的NIO线程组
        //第一个是Reactor线程组，即轮询的线程组
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        //第二个是工作的线程组，处理对应的读写
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try{
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup,workerGroup)
                .channel(NioServerSocketChannel.class)
                .option(ChannelOption.SO_BACKLOG,1024)
                .childHandler(new ChildChannelHandler());

            //绑定端口，同步等待成功
            ChannelFuture f = b.bind(port).sync();

            //等待服务器关闭监听端口
            f.channel().closeFuture().sync();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            //优雅退出，始放线程池资源
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }

    private class ChildChannelHandler extends ChannelInitializer<SocketChannel>{

        @Override
        protected void initChannel(SocketChannel socketChannel) throws Exception {
            socketChannel.pipeline().addLast(new TimeServerHandler());
        }
    }

    public static void main(String[] args) throws Exception{
        int port = 8080;
        if(args != null && args.length > 0){
            try{
                port = Integer.parseInt(args[0]);
            }catch (Exception e){
                port = 8080;
            }
        }
        new TimeServer().bind(port);
    }
}
